Track records. MS really hasn't done anything compelling over thr last decade hardaware-wise (plus the software that runs on it.)
MS:
Xbox (successful) As some said, this is highly debatable, business wise. It is true the Xbox division is the biggest financial black hole of the company. But some people seem to be missing the fact that XBL is still the preferred online platform, and it has a gigantic fanbase. They are not to kill it overnight because there's still a big profit potential from this. Entertainment wise, MS still wins, although Sony is slowly coming back up.
Zune (failure) AFAIK Zunes are still being sold, so until they decide to kill production you have no authority at all saying it is a failure.
Zune HD (not sure yet - but it isn't looking too promising)
Windows Mobile devices (failing) You keep insisting on calling things you don't like failure. A huge number of WM6 phone users would disagree with you. I agree that plain vanilla WM sucks, but with the immense amount of third party software this little devices can be quite amazing. There is a reason why most HTC owners like them
Pure and Turtle (WTF?)
Apple:
iPod + itunes (unbeatable to this day)
iPod Classic (what started it all)
iPod Nano - video (already making waves)
iPod Touch (revolutionary)
iPod Shuffle (meh, it's fine for what it is)
Macs
Macbooks
Macbook Pros
iMacs
all running OS X
(leaders in customer satisfaction; dominate the Premium end of the market)
Macbook Air (not a sales leader, but imitated relentlessly)
iPhone + OS X (revolutionary, currently unsurpassed)
So what do you expect our reaction to be when we hear about MS' latest "attempt", bearing in mind that the current management in Redmond is essentially unchanged from years ago?